65.Genus Moraxella.

Question 1

Morexella Habitat?

Answer 1

MORAXELLA

1. Habitat: • mucous membranes • upper respiratory tract • conjunctiva

Question 2

Morphology?

Answer 2

Morphology: • 1-3 µm coccoid rods • capsule • paired rods, paired cocci

Question 3

Staining and Culture?

Answer 3

3. Staining: • Gram-negative

4. Culture • obligate aerobic • fastidious • blood agar • serum agar

Question 4

Resistance and Species?

Answer 4

5. Resistance: • low

6. Species • M. lacunata: • human kerato-conjunctivitis • M. catarrhalis: • sinusitis, middle ear infection (children) • M. bovis • M. ovis

Question 5

M. bovis Morphology and culture?

Answer 5

M. bovis

1. Morphology: • rods in pairs, • fimbria
2. Culture: • fastidious, • blood agar, • β haemolysis

Question 6

Biochemistry antigens resistance M.Bovis

Answer 6

3. Biochemistry: • catalase +, • oxidase +, • haemolysine • citotoxin, damages the cornea • extra cellular enzymes • proteases, • hyaluronidase, • fibrinolysine
4. Antigens: • fimbria 7 groups
5. Resistance
6. Pathogenicity: • cattle infectious kerato-conjunctivitis (pink eye)

Question 7

M.ovis habitat Morphology and pathogenecity?

Answer 7

M. ovis:

1. Habitat: • sheep, calf • conjunctiva, nasal cavity
2. Morphology: • cocci in pairs, • fimbriae on some of them
3. Pathogenicity: • facultative pathogenic, • keratoconjunctivitis of sheep, goats and young calves